• 현장농수산연구지
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• 제20권2호
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• pp.31-38
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• 2018

본 연구에서는 보다 효율적인 도시녹화 및 정원식물 생산을 위해 도시녹화 및 정원에 이용되는 주요 초본류 가운데 하나인 해국 유묘에 대해 피트모스 대체재로 바이오차의 가능성을 살펴보고자 바이오차 처리 수준에 따른 해국 유묘의 생육차이를 조사하였다. 연구결과 바이오차를 혼합한 배양토 처리에 따른 해국 유묘의 생장은 피트모스, 버미큘라이트, 펄라이트(1:1:1, v/v), 바이오차, 피트모스, 버미큘라이트, 펄라이트(1:2:3:3, v/v) 처리구에서 우수한 경향을 보였다. 따라서 해국 재배 시 피트모스, 버미큘라이트, 펄라이트(1:1:1, v/v)의 인공용토에서 피트모스를 대체할 만한 생장 효과를 나타낸 처리 비율은 바이오차, 피트모스, 버미큘라이트, 펄라이트(1/3:2/3:1:1, v/v) 처리구로, 사용된 바이오차의 유형, 함께 사용된 상토의 재료, 혼합 비율 등이 영향을 주었을 것으로 사료된다.

• EDISON SW 활용 경진대회 논문집
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• 제2회(2013년)
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• pp.256-259
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• 2013

We investigate co-doping effects of conjugated P-N B-N with increasing of N concentration in the graphene sheets using a first principles based on the density functional theory. N doping sites of the graphene consider two possible sites (pyridinic and porphyrin-like). Energy calculation shows that additional doping of B atom in the porphyrin-like N doped graphene ($V+B-N_x$) is hard to form. At the low chemical potential of N, one N atom with additional doping in the graphene ($V+P-N_1$, $P/B-N_1$) has low formation energy on the other hand at high chemical potential of N, high concentration of N ($V+P-N_4$, $P/B-N_3$) in the graphene is governing conformation. From the results of electronic band structure calculation, it is found that $V+P-N_4$ and $P/B-N_3$ cases change the Fermi energy therefore type change is occurred. On the other hand, the cases of $V+P-N_1$ and N+B recover the electronic structure of pristine graphene.

• 음성과학
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• 제9권4호
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• pp.113-130
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• 2002

Measurements were made of pressure rise time (PoRT), voice cessation time, flattened peak intraoral air pressure (Po), pressure static time (PoST), pressure-fall time and the duration of oral closure as four English speakers uttered isolated nonsense $V_{1}CV_{2}$ words containing /b/ and /p/ ($V_{1}=V_{2}$ and the V was /$\alpha$/), with stress on either $V_{1}orV_{2}$ alternately. The hypothesis tested was: The tense stop consonant. will be characterized either by a higher Po or a longer PoST, and/or by both against lax. Findings: (1) PoRT was significantly greater in /b/ than /p/, (2) the voiceless stop /p/ produced generally greater mean Po, averaged across five tokens, than its voiced counterpart /b/, but statistically insignificant, and (3) altogether, across stress, tokens and subjects, the difference in the calculated pressure static time (PoSTc), i.e., PoST + PoRT, between /p/ and /b/ was highly significant (p $\leq$ 0.003). Although further investigations remain to be taken, the results strongly supported the linguistic hypothesis of tense-lax distinction, with /b/ being lax and /p/ tense. Airflow resistance at the glottis and supraglottal air volume are assumed to be responsible for much of difference in PoRT between /p/ and /b/. The PoSTc reflecting, although indirectly, the respiratory efforts during the oral closure of a stop, was a convincing phonetic parameter of the consonantal tenseness based on respiratory efforts. The effects of stress on Po and PoSTc were inconsistent, and the shorter PoRT than consonantal constriction interval was always accompanied by Po and PoST.

• Animal Systematics, Evolution and Diversity
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• 제24권2호
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• pp.169-172
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• 2008

Sequences of mitochondrial DNA (mtDNA) cytochrome b gene (1,140 bp) and control region (803 bp) of Siberian flying squirrels from Korea (Pteromys volans aluco) and Mt. Changbai of northeast China (P. v. arsenjevi) were obtained to reexamine the taxonomic status of the Korean subspecies. In the cytochrome b gene, six haplotypes of P. v. aluco formed a clade with six haplotypes of P. v. arsenjevi, and in control region, seven haplotypes of P. v. aluco formed a clade with six haplotypes of P. v. arsenjevi. Furthermore, six haplotypes of cytochrome b gene of P. v. aluco from this study formed a clade with four haplotypes of P. v. arsenjevi in far-east Russia obtained from GenBank. We also investigated the research papers previously published that reported the length of tail vertebrae of P. volans, and found that the length was not sufficiently large as to be a key character of P. v. aluco. This result is not consistent with morphological description for its haplotype. Therefore, we conclude that P. v. aluco from Korea might possibly be a synonym of P. v. arsenjevi from northeast China and nearby Russia.

• 전자공학회논문지D
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• 제36D권3호
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• pp.27-33
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• 1999

본 논문에서는 반도체 소자 제조 기술의 발전을 위하여 극 저 에너지 붕소(B),인(P), 및 비소(As) 이온 주입시 발생되는 채널링 현상이 초미세 접합깊이 형성에 미치는 영향에 관한여 개선된 MDRANGE 시뮬레이션 결과를 통하여 보여주고 있다. 본 연구에서 시뮬레이션된 5keV 이하의 에너지에서 조차도 이온 채널링 현상은 불순물의 농도 분포에 중요한 영향을 미치게 되는 것을 알 수 있었다. 붕소의 경우 500eV 이상의 에너지에서, 인의 경우 2 keV 이상의 에너지에서, 그리고 비소의 경우 대략 4 keV 이상의 에너지에서 채널링 현상이 불순물 분포에 크게 영향을 미치는 것으로 예측되었다. 또한 1 keV 붕소, 2 keV 인, 그리고 5keV 비소 이온 주입 에너지에서 경사도 7°인 경우와 경사도 0°인 경우의 2차원적인 농도분포를 통하여 채널링 현상이 측면 방향보다는 깊이 방향으로 대부분 발생되는 것을 볼 수 있었다.

• 한국광학회지
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• 제12권1호
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• pp.40-47
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• 2001

초고속 디지털 광통신용 $1.55{\mu}m$ InGaAsP/InGaAsP MQW 광흡수 변조기에서 각종 구조변수들이 광흡수변조기 성능에 미치는 영향을 체계적으로 조사분석하였다. 일반적으로 행하여지는 양자우물 수 $N_w$, 양자우물 두께 $t_w$, detuning 양 $\Delta\lambda$, 소자길이 L과 같은 구조 파라미터들에 더불어 본 연구에서 새롭게 제안한 SCH 영역내에 n형으로 도핑된 길이 $t_n$가 소자 성능에 미치는 영향을 해석하였다 이를 통해 소자길이 L=$100{\mu}m$의 광흡수변조기에서 구동 전압 $V_{\alpha}$=0~-2V 영역에서 동작하고 기초흡수 -1.5dB 이하, -1V에서 -2.92dB 및 -2V에서 -10.0dB 이상의 소광비를 주는 우수한 성능을 갖는 초고속 광흡수 변조기 설계가 가능하였다.

• Molecules and Cells
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• 제43권11호
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• pp.953-963
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• 2020

Coronavirus disease 2019 (COVID-19), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), is an infectious disease with multiple severe symptoms, such as fever over 37.5℃, cough, dyspnea, and pneumonia. In our research, microRNAs (miRNAs) binding to the genome sequences of severe acute respiratory syndrome coronavirus (SARS-CoV), Middle East respiratory-related coronavirus (MERS-CoV), and SARS-CoV-2 were identified by bioinformatic tools. Five miRNAs (hsa-miR-15a-5p, hsa-miR-15b-5p, hsa-miR-195-5p, hsa-miR-16-5p, and hsa-miR-196a-1-3p) were found to commonly bind to SARS-CoV, MERS-CoV, and SARS-CoV-2. We also identified miRNAs that bind to receptor proteins, such as ACE2, ADAM17, and TMPRSS2, which are important for understanding the infection mechanism of SARS-CoV-2. The expression patterns of those miRNAs were examined in hamster lung samples infected by SARS-CoV-2. Five miRNAs (hsa-miR-15b-5p, hsa-miR-195-5p, hsa-miR-221-3p, hsa-miR-140-3p, and hsa-miR-422a) showed differential expression patterns in lung tissues before and after infection. Especially, hsa-miR-15b-5p and hsa-miR-195-5p showed a large difference in expression, indicating that they may potentially be diagnostic biomarkers for SARS-CoV-2 infection.

• BMB Reports
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• 제32권3호
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• pp.226-231
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• 1999

In vitro effects of acetone on cytochrome P450 (P450)-dependent benzo(a)pyrene (B(a)P) hydroxylation supported by cumene hydroperoxide (CuOOH) or NADPH/$O_2 $ systems were studied using 3-methylcholanthrene-pretreated rat liver microsomes. The maximal rate of B(a)P hydroxylation at constant concentration ($80\;{\mu}M)$ of the substrate was observed in the presence of $30\;{\mu}M$ CuOOH. However, at concentrations higher than $30\;{\mu}M$ CuOOH the hydroxylation rates were rapidly decreased. In contrast to CuOOH, at a concentration of $200\;{\mu}M$ NADPH, B(a)P hydroxylation rate reached a plateau. At concentrations higher than $200\;{\mu}M$ NADPH, the rates of substrate hydroxylation were maintained at the maximal rate with no inhibition. Acetone at 1% (v/v) enhanced both CuOOH- and NADPH/$O_2$-supported B(a)P hydroxylation at the optimal concentrations of the cofactors. At concentrations higher than 1% (v/v) acetone, substrate hydroxylation was sterero specific under the support of these two cofactors; it was strongly enhanced with $30\;{\mu}M$ CuOOH, but rather inhibited in the $200\;{\mu}M$> NADPH/$0_2 $ system. The lipid peroxidation rate induced during CuOOH-supported P450-dependent B(a)P hydroxylation was increased as CuOOH concentrations were increased. Acetone in the concentration range of 2.5~7.5%(v/v) inhibited lipid peroxidation during CuOOH supported B(a)P hydroxylation. The finding that CuOOH-supported B(a)P hydroxylation is greatly enhanced by acetone suggests that acetone may contribute more to the activation of oxygen (for the insertion of oxygen into the substrate) in the presence of CuOOH than with NADPH/$O_2$. Acetone may also contribute to the partial inhibition of destruction of microsomal membranes by lipid peroxidation.

• 대한수학회논문집
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• 제20권3호
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• pp.427-436
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• 2005

Let (R, m) be a 2-dimensional regular local ring with algebraically closed residue field R/m. Let K be the quotient field of R and v be a prime divisor of R, i.e., a valuation of K which is birationally dominating R and residually transcendental over R. Zariski showed that there are finitely many simple v-ideals $m=P_0\;{\supset}\;P_1\;{\supset}\;{\cdotS}\;{\supset}\;P_t=P$ and all the other v-ideals are uniquely factored into a product of those simple ones. It then was also shown by Lipman that the predecessor of the smallest simple v-ideal P is either simple (P is free) or the product of two simple v-ideals (P is satellite), that the sequence of v-ideals between the maximal ideal and the smallest simple v-ideal P is saturated, and that the v-value of the maximal ideal is the m-adic order of P. Let m = (x, y) and denote the v-value difference |v(x) - v(y)| by $n_v$. In this paper, if the m-adic order of P is 2, we show that $O(P_i)\;=\;1\;for\;1\;{\leq}\;i\; {\leq}\;{\lceil}\;{\frac{b+1}{2}}{\rceil}\;and\;O(P_i)\;=2\;for\;{\lceil}\;\frac{b+3}{2}\rceil\;{\leq}\;i\;\leq\;t,\;where\;b=n_v$. We also show that $n_w\;=\;n_v$ when w is the prime divisor associated to a simple v-ideal $Q\;{\supset}\;P$ of order 2 and that w(R) = v(R) as well.

• 말소리와 음성과학
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• 제2권3호
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• pp.23-27
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• 2010

The purpose of this study was to find how English vowels /a, e, i, o, u/ affect the production of English labials /p, b, f, v/ by Korean learners of English. Sixty syllables were composed by five vowels and four labials in the syllable types CV, VC, and VCV. The nonsense syllables were produced three times by nine subjects. The major results show that (1) in inter-vocalic position, the subjects had higher scores in producing /v/ composed with /a, e, o/ and /u/, while subjects had lower scores in producing /p/ with /i/ and /o/, (2) in post-vocalic position, the subjects had higher scores in producing /v/ and /f/ with /a, e/, and /o/, while subjects had lower scores in producing /b/ with /e/ and /i/, and (3) in pre-vocalic position, the subjects had higher scores in producing /v/ with /e, o, u/ and /f/ with /u/, while subjects had lower scores in producing /b/ with /e/, /i/ and /u/. The results suggest that on the whole, Korean learners of English have much difficulty in producing /p/ with /i/ in inter-vocalic condition and /b/ with /i, /e/ in pre-vocalic position.